Accurate structure analyses of polymer crystals on the basis of wide-angle X-ray and neutron diffractions

Tashiro, Koji*; Hanesaka, Makoto*; Yamamoto, Hiroko*; Wasanasuk, K.*; Jayaratri, P.*; Yoshizawa, Yoshinori*; Tanaka, Ichiro*; Niimura, Nobuo*; Kusaka, Katsuhiro*; Hosoya, Takaaki*; et al.

Kobunshi Rombunshu, 71(11), p.508 - 526, 2014/11

https://doi.org/10.1295/koron.71.508

The crystal structure analysis of various polymer substances has been reviewed on the basis of wide-angle high-energy X-ray and neutron diffraction data. The progress in structural analytical techniques of polymer crystals have been reviewed at first. The structural models proposed so far were reinvestigated and new models have been proposed for various kinds of polymer crystals including polyethylene, poly(vinyl alcohol), poly(lactic acid) and its stereocomplex etc. The hydrogen atomic positions were also clarified by the quantitative analysis of wide-angle neutron diffraction data, from which the physical properties of polymer crystals have been evaluated theoretically. The bonded electron density distribution has been estimated for a polydiacetylene single crystal on the basis of the so-called X-N method or by the combination of structural information derived from X-ray and neutron diffraction data analysis. Some comments have been added about future developments in the field of structure-property relationship determination.

Study of increasing the beam power on the negative ion based neutral beam injector for JT-60U

Kuriyama, Masaaki; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Hikida, Shigenori*; Honda, Atsushi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; Kusaka, Makoto*; et al.

Fusion Engineering and Design, 56-57(Part.A), p.523 - 527, 2001/10

https://doi.org/10.1016/S0920-3796(01)00341-6

no abstracts in English

Operation of the positive-ion based NBI system for JT-60U

Ohara, Hiroshi; Akino, Noboru; Ebisawa, Noboru; Hikida, Shigenori*; Honda, Atsushi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; Kusaka, Makoto*; Kuriyama, Masaaki; et al.

Fusion Technology, 39(2-Part2), p.1140 - 1144, 2001/03

no abstracts in English

Power flow in the negative-ion based neutral beam injection for JT-60

Kuriyama, Masaaki; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Hikida, Shigenori*; Honda, Atsushi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; Kusaka, Makoto*; et al.

Review of Scientific Instruments, 71(2), p.751 - 754, 2000/02

https://doi.org/10.1063/1.1150283

no abstracts in English

Increasing the beam power of the JT-60 negative ion based neutral beam system

Kuriyama, Masaaki; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Hikida, Shigenori*; Honda, Atsushi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; Kusaka, Makoto*; et al.

Proceedings of the 18th IEEE/NPSS Symposium on Fusion Engineering (SOFE '99), p.133 - 136, 1999/00

no abstracts in English

Degradation in dielectric strength of FRP insulators and its countermeasure in a static Scherbius system speed controllor of the JT-60 motor generator

; Kusaka, Makoto*

JAERI-Tech 97-025, 20 Pages, 1997/07

JAERI-Tech-97-025.pdf:1.26MB

no abstracts in English

Current status of IBARAKI biological diffractometer in J-PARC; Optimization of design parameters

Kusaka, Katsuhiro; Ohara, Takashi; Tanaka, Ichiro*; Niimura, Nobuo*; Kurihara, Kazuo; Hosoya, Takaaki; Ozeki, Tomoji*; Aizawa, Kazuya; Morii, Yukio; Arai, Masatoshi; et al.

no journal, , 

Ibaraki prefecture has started to construct IBARAKI biological crystal diffractometer for industrial use at MLF, J-PARC. It is designed to achieve the efficiency which is more than 50 times larger than the present high performance diffractometer BIX-4. To realize this performance, the diffractometer will be installed on a coupled moderator has more intense peak but wider pulse shape than a decoupled one. It is expected that some neighbor Bragg spots will overlap partially each other along the time axis. The overlapping of Bragg spots should be considered for optimization of design parameters and it is necessary to de-convolute the overlapped spots. The three original simulation programs of TOF diffraction data with designed parameters of the diffractometer were developed to obtain information of spot-overlapping, completeness of Bragg spots and spot profiles along the time axis. The consideration of important designed parameters will be reported based on the simulation results.

Current status of IBARAKI biological diffractometer in J-PARC; Design of the neutron optics

Ohara, Takashi; Kurihara, Kazuo; Kusaka, Katsuhiro; Hosoya, Takaaki; Tanaka, Ichiro*; Niimura, Nobuo*; Ozeki, Tomoji*; Aizawa, Kazuya; Morii, Yukio; Arai, Masatoshi; et al.

no journal, , 

Ibaraki Prefectural Government in Japan has started to construct a TOF single crystal neutron diffractometer for biological macromolecules for industrial use at J-PARC. For this diffractometer, design of an efficient neutron transportation system is important because this diffractometer has 40m source-sample distance. Recently, we designed a supermirror neutron guide which can transport 0.7-3.8 Angstrom neutron efficiently. The total length of the mirror section is 25m. At the first 17m, the mirror has curvature (R=4300m) for horizontal direction in order to remove high-energy neutron and ray. Simultaneously, all of the mirror section has tapered angle for vertical direction in order to reduce the frequency of neutron reflection at the surface of the supermirror. The neutron flux and profile at the sample position was calculated by Monte Carlo simulation softwares, McStas and IDEAS and compared with a curved, non-tapered guide we had designed previously. In result, the new supermirror system has 2 times gain for 0.7 Angstrom neutron and 1.5 times for 1.5 Angstrom neutron, and the beam profile at the sample position has a rectangular shape.

Current status of IBARAKI biological crystal diffractometer in J-PARC

Tanaka, Ichiro*; Ohara, Takashi; Kurihara, Kazuo; Kusaka, Katsuhiro*; Hosoya, Takaaki; Tomoyori, Katsuaki*; Niimura, Nobuo*; Ozeki, Tomoji*; Aizawa, Kazuya; Arai, Masatoshi; et al.

no journal, , 

IBARAKI Biological Crystal Diffractometer is a new single-crystal neutron diffractometer for biological and chemical crystallography, and is now being constructed at J-PARC by Ibaraki Prefectural Government in Japan. This diffractometer is designed for the protein crystals with the cell dimension up to 135 . The measurement efficiency is more than 50 times larger than the present neutron diffractometer, BIX-3/BIX-4 in JRR-3 reactor at JAEA. To achieve this performance, we have selected a coupled moderator, and worked out the optimisation of the neutron guide tube. For the detector, a new wavelength-shifting-fiber type scintillation area detector system with high spatial (0.5-1.0 mm) and time (1ms-) resolution are in development.